A sample of 100 students from a private school produces a mean score of 71.30. The population mean (m) for students from public high schools is 75.62. The population standard deviation is 28. Zobt is - 1.54. Zcrit is ± 1.96. What is the null and alternative hypothesis

Question

anonymous · Answer

Answer: one-tailed test, because need to show higher or lower performance on a test of social skills.

Alternative hypothesis: mu not = 75.62

Null hypothesis: mu = 75.62

Hence, Zobt is - 1.54 is between Zcrit (-1.96, 1.96).

Fail to reject null hypothesis.

conclusion: private school has same social skills compared to public school.

anonymous · Answer

http://tutorteddy.com/site/free_stat_help1.php?id=NzA3NQ==

anonymous · Answer

what is the probablilty of making a Type I error?

perl · Answer

hello

perl · Answer

give me a sec to read this over, what is zobt stand for ?

perl · Answer

you want a two tailed test, not a one tailed

perl · Answer

the alternative hypothesis is mu not 75.62, ? thats a two tailed test

anonymous · Answer

hello perl, I do not understand this stuff

perl · Answer

Use a two-tail test, because the researchers want to know if school type "leads to higher or lower performance". So, they want to know either way ... higher or lower.

anonymous · Answer

Linda, try searching your questions exactly as there typed on your test/homework on google and see what others has said, google is really helpful most of the time finding your answers, i know what you mean... its been many years since i been in school, and the algebra is kicking my but

anonymous · Answer

the question is big, it is for a paper, i will post it in it's entirety

anonymous · Answer

A researcher asks whether attending a private high school leads to higher or lower performance on a test of social skills when compared to students attending public schools. A sample of 100 students from a private school produces a mean score of 71.30. The population mean (m) for students from public high schools is 75.62. The population standard deviation is 28. Zobt is - 1.54. Zcrit is ± 1.96.

    Should the researcher use a one-tailed or a two-tailed test? Why?
    What is the alternative hypothesis?
    What is the null hypothesis?
    What should the researcher conclude about this relationship in the population?
    Are the results significant? Explain your response.
    What is the probability of making a Type I error?
    If a Type I error were made, what would it mean?
    What is the probability of making a Type II error?
    If a Type II error were made, what would it mean?

perl · Answer

it would be easier if we graphed this |dw:1356142377761:dw|